Json value gets cut off

[MatjazBostic]

hi, I have asked a question on Stack Exchange, but I think I should also post the problem here.
The link is: https://stackoverflow.com/questions/62436798/flutter-blue-json-value-gets-cut-off

[oddko]

Hi, the problem definitely comes from the ATT MTU that is likely negociated at its minimum (23 bytes), which with the ATT header for a Notification (3 bytes) makes you able to only exchange 20 bytes at once, hence why your notification gets truncated at 20 bytes. Either find a way to negociate a higher MTU (can usually go up to 512 bytes), or find a way to trigger a characteristic long read, ie the central should issue read (blob) requests after a notification with a filled PDU is received. Not sure if iOS/Android support such behavior.

[MatjazBostic]

@nmbus Thanks, I had to use await device.requestMtu(512); and now it works.

[arizki29]

i have same isue.
where should i put the code (await device.requestMtu(512);) ???
thx

[MatjazBostic]

@arizki29 You should put it after you connect to the device ( after await device.connect();)

[arizki29]

@mbostic I have tried to put it here after "await device.connect();" but the results always return to default 23.
this my result:

D/FlutterBluePlugin(27476): [onServicesDiscovered] count: 3 status: 0
D/BluetoothGatt(27476): configureMTU() - device: 4C:24:98:77:6F:B1 mtu: 512
D/BluetoothGatt(27476): setCharacteristicNotification() - uuid: 0000ffe1-0000-1000-8000-00805f9b34fb enable: true
I/flutter (27476):
D/BluetoothGatt(27476): onConfigureMTU() - Device=4C:24:98:77:6F:B1 mtu=23 status=0
D/FlutterBluePlugin(27476): [onMtuChanged] mtu: 23 status: 0

note : flutter_blue: ^0.7.2

[yasasmi]

@nmbus hi I'm using flutter_blue forget data from my MIband 5 but it gave me an empty array and disconnecting the device how can I solve this issue cus I cant understand what is the specific root for this matter. if I can get help it will be really helpfi. thank you!

[Logamuhilan]

hi there. I am new to flutter : ) I am using flutter_blue to connect and get bluetooth device data, my problem is i dont know the method to get data from it. please give me some methods to get it. i have used "await c.read" it gives only device name, and "await d.read" it gives only empty array. here "c" and "d" is characteristics. thanks in advance ; )